RE: lua_pcall
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- Subject: RE: lua_pcall
- From: "Nick Trout" <nick@...>
- Date: Wed, 4 Feb 2004 10:45:16 -0800
> Is there some sample source code showing how to use lua_pcall with
> err_func != 0? Basically when I'm calling into Lua and an error
> occurs I'd like to see the debug traceback, but I'm not quite sure how
> to do that based on the docs.
Debug traceback has to be called before you return from a pcall because
the stack is unwound afterwards.
Untested, from memory:
static int err_func_l (lua_State *L)
{
printf("Error report: %s\n", lua_tostring(L, -1)); // err
message
lua_pushliteral(L, "debug");
lua_gettable(L, LUA_GLOBALSINDEX);
lua_pushliteral(L, "traceback"); // correct fn name?
lua_gettable(L, -2);
lua_pcall(L, -1); // call "debug.traceback()"
}
void init(lua_State *L)
{
lua_register(L, "err_func", err_func_l);
lua_register(L, "foo", foo_l);
}
void call_my_func(lua_State *L)
{
lua_pushliteral(L, "err_func");
// call Lua fn foo with "C prototype" number foo(number)
lua_pushliteral(L, "foo");
lua_gettable(L, LUA_GLOBALSINDEX);
lua_pushnumber(L, <arg1>);
int ret = lua_pcall(L, 1, 1, -3);
if (ret != 0)
{
// error -- deal with it...
return;
}
lua_Number retValue = lua_tonumber(L, -1);
lua_pop(L, 1+1); // pop err func and return value
}